Every Minecraft version, every build, every requirement.

Embeddium prints a taint warning naming every mod that patched its internals. It is a support disclaimer, not an error, and removing the named mod usually makes things worse. How to read the line and what it is actually telling you.

A Forge 1.20.1 crash names two mods that are not in your mods folder. Two separate packaging mechanisms stack to produce it: mods that register under another mod's id, and mods bundled inside other mods. Once you know both, the error reads plainly.

BTW:CE, Back2Beta, BetterBeta, Legacy+ and three separate loaders all target legacy Minecraft, and none of them are the same thing. A map to which one covers your version and where its real wiki lives.

Armor rendering moved off plain layer_1/layer_2 PNGs and onto a separate equipment JSON system in 1.21.2 through 1.21.4. Updating the item icon does not fix the worn texture. What changed, where the new files live, and how to migrate.

World conversion is one way. Once a world opens on a newer version it will not open on the old one again, which makes the backup the only way back.